8b - this model comes on the market from time to time, but is scarce compared to top lever guns. I'm not sure of patents, but it is similar in appearance and function to the Woodward "The Automatic" UL model (a pair of restocked non-ejectors of 1885 production sold at Bonham's this week for about $11,000).
I have one 12 bore, 27" barrels, 14 1/2" LOP Purdey UL non-ejector in the MOI database: 6# 12 oz, 4 5/8" balance to front trigger, unmounted swing of 1.34, mounted swing of 6.66, and half weight radius of 9.59. This is well within the game gun handling envelope. I recall the gun had very fancy carved leaf and vine fences.
